A5092120633- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Superconducting and THz Device Technology
- Machine Learning in Materials Science
- Atmospheric Ozone and Climate
- Superconducting Materials and Applications
- Atmospheric and Environmental Gas Dynamics
- Calibration and Measurement Techniques
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Graphene research and applications
- International Science and Diplomacy
Abstract A series of data samples was collected with the Belle II detector at SuperKEKB collider from March 2019 to June 2022. We determine integrated luminosities these using three distinct methodologies involving Bhabha ( ), digamma and dimuon ) events. The total luminosity obtained Bhabha, digamma, events is (426.88 ± 0.03 2.61) fb −1 , (429.28 2.62) (423.99 0.04 3.83) where first uncertainties are statistical second systematic. resulting combination methods (427.87 2.01) .
We measure the time-integrated <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math> asymmetry in <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>D</c:mi><c:mn>0</c:mn></c:msup><c:mo stretchy="false">→</c:mo><c:msubsup><c:mi>K</c:mi><c:mi>S</c:mi><c:mn>0</c:mn></c:msubsup><c:msubsup><c:mi>K</c:mi><c:mi>S</c:mi><c:mn>0</c:mn></c:msubsup></c:math> decays reconstructed <f:math...
Using data samples of 102 million Upsilon(1S) events and 158 Upsilon(2S) collected by the Belle detector at KEKB asymmetric-energy e+e- collider, we search for [udsccbar] pentaquark states decaying to Jpsi Lambda. first observations Upsilon(1S, 2S) inclusive decays Lambda, find evidence P_ccbars(4459)0 state with a significance 3.3 standard deviations, including statistical systematic uncertainties. We measure mass width Pccbars(4459)0 be (4471.7 +- 4.8 0.6) MeV/c2 (21.9 13.1 2.7) MeV,...
We measure the branching fraction of decay <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mi>B</a:mi></a:mrow><a:mrow><a:mn>0</a:mn></a:mrow></a:msup><a:mo stretchy="false">→</a:mo><a:mi>J</a:mi><a:mo>/</a:mo><a:mi>ψ</a:mi><a:mi>ω</a:mi></a:mrow></a:math> using data collected with Belle II detector at SuperKEKB collider. The contain <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mo...
A bstract We perform the first search for CP violation in $$ {D}_{(s)}^{+}\to {K}_S^0{K}^{-}{\pi}^{+}{\pi}^{+} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>D</mml:mi> <mml:mfenced> <mml:mi>s</mml:mi> </mml:mfenced> <mml:mo>+</mml:mo> </mml:msubsup> <mml:mo>→</mml:mo> <mml:mi>K</mml:mi> <mml:mi>S</mml:mi> <mml:mn>0</mml:mn> <mml:msup> <mml:mo>−</mml:mo> </mml:msup> <mml:mi>π</mml:mi> </mml:math> decays. use a combined data set from Belle and II experiments,...
We measure the branching fraction and <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>C</a:mi><a:mi>P</a:mi></a:math>-violating flavor-dependent rate asymmetry of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>B</c:mi><c:mn>0</c:mn></c:msup><c:mo stretchy="false">→</c:mo><c:msup><c:mi>π</c:mi><c:mn>0</c:mn></c:msup><c:msup><c:mi>π</c:mi><c:mn>0</c:mn></c:msup></c:math> decays reconstructed using Belle II detector in an...
We present a measurement of the branching fraction and longitudinal polarization <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mi>B</a:mi></a:mrow><a:mrow><a:mn>0</a:mn></a:mrow></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mrow><a:mi>ρ</a:mi></a:mrow><a:mrow><a:mo>+</a:mo></a:mrow></a:msup><a:msup><a:mrow><a:mi>ρ</a:mi></a:mrow><a:mrow><a:mo>−</a:mo></a:mrow></a:msup></a:mrow></a:math> decays, which have two <d:math...
We present a measurement of the branching fraction $B^+\to\tau^+\nu_\tau$ decays using $(387\pm6)\times 10^6$ $\Upsilon(4S)$ collected between 2019 and 2022 with Belle II detector at SuperKEKB $e^+e^-$ collider. reconstruct accompanying $B^-$ meson hadronic tagging method, while candidates are identified in recoil. find evidence for 3.0 standard deviations, including systematic uncertainties. The measured is $\mathcal{B}(B^+\to\tau^+\nu_\tau) = [1.24 \pm 0.41 (\text{stat.}) 0.19...
A series of data samples was collected with the Belle~II detector at SuperKEKB collider from March 2019 to June 2022. We determine integrated luminosities these using three distinct methodologies involving Bhabha ($e^+e^- \to e^+e^-(n\gamma)$), digamma \gamma\gamma(n\gamma)$), and dimuon \mu^+ \mu^- (n\gamma)$) events. The total luminosity obtained Bhabha, digamma, events is ({426.88} $\pm$ 0.03 {2.61})~fb$^{-1}$, ({429.28} {2.62})~fb$^{-1}$, ({423.99} 0.04 {3.83})~fb$^{-1}$, where first...
We perform a model-independent measurement of the $D^0$-$\overline{D}{}^0$ mixing parameters using samples $e^+e^-$-collision data collected by Belle and II experiments that have integrated luminosities $951\ \text{fb}^{-1}$ $408\ \text{fb}^{-1}$, respectively. Approximately $2.05\times10^6$ neutral $D$ mesons are reconstructed in $D^0\rightarrow K^0_{S}\pi^+\pi^-$ channel, with flavor tagged charge pion $D^{*+}\rightarrow D^0\pi^+$ decay. Assuming charge-parity symmetry, measured to be $ x...
We present a search for the baryon number <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>B</a:mi></a:math> and lepton <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>L</c:mi></c:math> violating decays <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:msup><e:mi>τ</e:mi><e:mo>−</e:mo></e:msup><e:mo stretchy="false">→</e:mo><e:mi mathvariant="normal">Λ</e:mi><e:msup><e:mi>π</e:mi><e:mo>−</e:mo></e:msup></e:math>...
We measure the branching fraction of decay $B^0 \to J/\psi \omega$ using data collected with Belle II detector at SuperKEKB collider. The contain $(387 \pm 6) \times 10^6$ $B\overline{B}$ meson pairs produced in energy-asymmetric $e^+e^-$ collisions $\Upsilon (4S)$ resonance. measured $\mathcal{B}(B^0 \omega) = \left( 2.16 0.30 0.14 \right) 10^{-5}$, where first uncertainty is statistical and second systematic, more precise than previous results constitutes observation a significance $6.5$...
We measure the branching fraction and $\it CP$-violating flavor-dependent rate asymmetry of $B^{0} \to \pi^{0} \pi^{0}$ decays reconstructed using Belle II detector in an electron-positron collision sample containing $387 \times 10^{6}$ $B\overline{B}$ pairs. Using optimized event selection, we find $126\pm 20$ signal a fit to background-discriminating flavor-sensitive distributions. The resulting is $(1.25 \pm 0.23)\times 10^{-6}$ $0.03 0.30$.
We present a measurement of the branching fraction and longitudinal polarization $B^0 \to \rho^+ \rho^-$ decays, which have two $\pi^0$'s in final state. also measure time-dependent $CP$ violation parameters for decays into longitudinally polarized $\rho^+ pairs. This analysis is based on data sample containing $(387\pm6) \times 10^6$ \BBbar pairs collected with Belle~II detector at SuperKEKB asymmetric-energy $e^+e^-$ collider 2019-2022. obtain ${B}(B^0\to\rho^+\rho^-) = (2.88...
We present a search for the baryon number $B$ and lepton $L$ violating decays $\tau^- \rightarrow \Lambda \pi^-$ \bar{\Lambda} produced from $e^+e^-\to \tau^+\tau^-$ process, using 364 fb$^{-1}$ data sample collected by Belle~II experiment at SuperKEKB collider. No evidence of signal is found in either decay mode, which have $|\Delta(B-L)|$ equal to $2$ $0$, respectively. Upper limits 90\% credibility level on branching fractions \Lambda\pi^-$ \bar{\Lambda}\pi^-$ are determined be $4.7...
We perform the first search for $C\!P$ violation in ${D_{(s)}^{+}\to{}K_{S}^{0}K^{-}\pi^{+}\pi^{+}}$ decays. use a combined data set from Belle and II experiments, which study $e^+e^-$ collisions at center-of-mass energies or near $\Upsilon(4S)$ resonance. 980 fb$^{-1}$ of 428 Belle~II. measure six $C\!P$-violating asymmetries that are based on triple products quadruple momenta final-state particles, also particles' helicity angles. obtain precision level 0.5%...
The second PyHEP.dev workshop, part of the "Python in HEP Developers" series organized by Software Foundation (HSF), took place Aachen, Germany, from August 26 to 30, 2024. This gathering brought together nearly 30 Python package developers, maintainers, and power users engage informal discussions about current trends Python, with a primary focus on analysis tools techniques High Energy Physics (HEP). workshop agenda encompassed range topics, such as defining scope data analysis, exploring...
We measure the time-integrated CP asymmetry in $D^{0} \rightarrow K^{0}_{S}K^{0}_{S}$ decays reconstructed $e^{+}e^{-} c\overline{c}$ events collected by Belle and II experiments. The corresponding data samples have integrated luminosities of 980 fb$^{-1}$ 428 fb$^{-1}$, respectively. $D^{0}$ are required to originate from $D^{*+} D^{0}\pi^{+}$ decay, which determines charm flavor at production time. A control sample K^{+}K^{-}$ is used correct for detection asymmetries. result,...
We present the study of a fuzzy clustering algorithm for Belle II electromagnetic calorimeter using Graph Neural Networks. use realistic detector simulation including simulated beam backgrounds and focus on reconstruction both isolated overlapping photons. find significant improvements energy resolution compared to currently used photons more than 30% with energies E < 0.5 GeV high levels backgrounds. Overall, GNN improves reduces tails reconstructed distribution therefore is promising...